Usage: AKICK <#channel> <ADD|DEL|LIST|WIPE> [<mask>] [<reason>]
This command is used to manipulate a channel's AKICK list. AKICKs are enforced by the server the moment a user matching an AKICK list entry joins the channel. The user will be kicked and the mask will be banned.
/helpserv akick add
/helpserv akick list
AKICKs are the best way to ban certain nick masks or known users, because ban lists tend to get wiped now and then, an AKICK sticks and is enforced on sight. However, you don't want to make the mask too general, as it may affect many users that were not at all involved.
Note: this command replaces the service command /CS AKICK.